Shimano Ultegra Di2: Installing the Latest Electronic Group

Ultegra Di2 and Mechanical Hood Shape

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The lever and hood shape of Ultegra's Di2 (bottom) is notably thinner and longer than Ultegra mechanical (top). The mechanical version also has a more dramatically doglegged shape than the Di2 version. Another significant difference: The mechanical lever blade is carbon, the Di2 is aluminum.